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I have an HVL20 on my A900 to trigger my HVL42 off-camera. It works well, and is a lot of fun. I'd like to get another flash for off-camera use, and I am wondering if another HVL42 is the way to go, or whether I should splash out on an HVL58.

With the excellent little HVL20 as my on-camera flash trigger (I'm pretty sure it can't be used off-camera), I don't need the HVL58 to perform that task. What I don't know is whether the HVL58 will still be able to offer its 'ratio' function with the HVL42 when used off-camera. It would be useful if it could, but does anyone know?

(I tried posting this earlier but seem to have failed, so apologies if you've read this before!)

The 58 as I understand will give you ratio control as long as it is the commander (ie. connected to the camera). You will not be able to use the 20 as a trigger of your remaining flashes with ration control.

A side note, that I assume would work, would be to use some synch cable to get the 58 of the camera and still have command capabilities.

I hope to be in a position to test sometime next week when my 58 arrives.